【摘要】 本文应用ＴＷＩＮＳＰＡＮ等级分类和ＰＣＡ，ＤＣＡ排序技术对甘肃酒泉地区的天然胡扬林分进行了分类和排序，并将排序的结果与环境因子之间进行了回归分析。结果表明，（１）甘肃酒泉地区的胡杨天然林分可以被划分为４个类型，这四个类型在生长更新状况及生境条件方面存在着较显著的差异，而在林分的龄级结构上并无显著区别．（２）酒泉地区胡杨生长的主要限制因子是地下水位，水矿化度，土壤总盐量及ＣＬ￣－含量，ＰＨ值不是影响胡杨林生长的主要限制因子。而气候因子对酒泉地区胡杨林的影响并不大。更多还原

【Abstract】 This paper made the quantitative classification and the ordination for Populus eu-phratica Oliv’s natural forset stand in Gansu Jinquan by TWINSPAN quantitative cassifi-cation and PCA,DCA ordination techniques,and the regressive analysis between the ordi-national results and the environmenta factors. The results show:(1)The Populus euphrat-ica Oliv’s natural forest stand in Gansu Jiuquan Can be calssified four types.there are ob-vious differences in the growing and environmental condition. but not in the age structureof the forest stand between these four types.(2)The mainly restrictive factors which affectthe growth of Populus euphratica Oliv in Jiuquaa are water table,mineralization degree ofthe water.the contents of salt and Cl￣- in the soil.but pHvalue is,not a important one.Inaddition,the effect of the climatic factors for the growth of Populus euphratica Oliv in Ji-uquan is not significant.更多还原